TMS Kobo Original Sound Improvement Goods Yamaha Sax Spacer-kun (Titanium) Limited production and Kobo exclusive sale As a model change, the material has been reviewed to produce a richer sound. However, as there is a tendency for the sound to become slightly harder, it has been heat-treated. This is a sound improvement good that is inserted between the Yamaha screw and the seat. The ease of sound production and resonance will change. Outer diameter 10, thickness 1, hole diameter 5.5 Made of overseas titanium, processed in Japan. Just by inserting it between the thumb hook screw and the seat, it has a considerable effect, and it sells well even when made in the kobo, so we will put it out here as well.